Similar changes in muscle fiber phenotype with differentiated consequences for rate of force development: Endurance versus resistance training
Similar changes in muscle fiber phenotype with differentiated consequences for rate of force development: Endurance versus resistance training
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DOI：
10.1016/j.humov.2014.01.005
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发表时间：
2014-04-01
影响因子：
2.1
通讯作者：
Kjolhede, Tue
中科院分区：
文献类型：
--
作者：
Farup, Jean;Sorensen, Henrik;Kjolhede, Tue
阻力训练已被证明对力量发展率（RFD）有积极影响，而目前还没有关于耐力训练对RFD影响的数据。受试者完成了10周的阻力训练（RT，n = 7）或耐力自行车（END，n = 7）。术前和术后测量包括从m.股外侧肌以量化纤维表型和纤维面积，等速测力计测试以量化膝伸肌和屈肌在最大等长收缩期间0-30、0-50、0-100和0-200 ms的最大扭矩（Nm）和RFD（Nm/s）。两组都增加了ha型纤维的面积百分比（p <0.01），降低了IIx型纤维的面积百分比（p = 0.05），而只有RT增加了纤维尺寸（p <0.05）。RT显著增加膝关节伸肌和屈肌的离心、同心和等长力量，而END则没有。RT使膝屈肌RFD增加200 ms（p <0.01），并在100 ms时有增加的趋势（p <0.1），而在30、50和100 ms时观察到END组有减少的趋势（p <0.1），导致RT在术后的RFD高于END（p <0.01）。总之，阻力训练可能对维持RFD非常重要，而耐力训练可能会对RFD产生负面影响。(C)© 2014 Elsevier B. V.保留所有权利。
Resistance training has been shown to positively affect the rate of force development (RFD) whereas there is currently no data on the effect of endurance training on RFD. Subjects completed ten weeks of either resistance training (RT, n = 7) or endurance cycling (END, n = 7). Pre and post measurements included biopsies obtained from m. vastus lateralis to quantify fiber phenotype and fiber area and isokinetic dynamometer tests to quantify maximal torque (Nm) and RFD (Nm/s) at 0-30, 0-50, 0-100 and 0-200 ms during maximal isometric contraction for both knee extensors and flexors. Both groups increased the area percentage of type ha fibers (p < .01) and decreased the area percentage of type IIx fibers (p = .05), whereas only RT increased fiber size (p < .05). RT significantly increased eccentric, concentric and isometric strength for both knee extensors and flexors, whereas END did not. RT increased 200 ms RFD (p < .01) in knee flexor RFD and a tendency towards an increase at 100 ms (p < .1), whereas tendencies towards decreases were observed for the END group at 30,50 and 100 ms (p < .1), resulting in RT having a higher RFD than END at post (p < .01). In conclusion, resistance training may be very important for maintaining RFD, whereas endurance training may negatively impact RFD. (C) 2014 Elsevier B.V. All rights reserved.